1. Draw Less than type cumulative frequency curve
| Class | Frequency |
| 20 - 25 | 110 |
| 25 - 30 | 170 |
| 30 - 35 | 80 |
| 35 - 40 | 45 |
| 40 - 45 | 40 |
| 45 - 50 | 35 |
Solution:To draw Less than type cumulative frequency curve, we first prepare the following table
| Class | Frequency
`f` | < Upper | `cf` |
| 15 - 20 | - | 20 | 0 |
| 20 - 25 | 110 | 25 | 110 |
| 25 - 30 | 170 | 30 | 280 |
| 30 - 35 | 80 | 35 | 360 |
| 35 - 40 | 45 | 40 | 405 |
| 40 - 45 | 40 | 45 | 445 |
| 45 - 50 | 35 | 50 | 480 |
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